Improvement in nut-locks



M. A. SPAFFORD.

I NUT-LOCK. No. 1781086.: Patented May 30,1876.

YIIQVEINTORI g gi vention appertains to make and use the same,

' tudinal section of the same.

groove in the screw-threaded part of the bolt,

tongue, which may be set into the said groove UNITED STATES PATENTOFFICE.-.

MARK A. SPAFFOBD, OF CHICAGO, ILLINOIS, ASSIGNOR TO ERE EEIGK H.BROWN'AND M. A. H. BROWN, 0E sAME PLAOE.

IMPROVEMENT IN NUT-LOCKS.

Specification forming part of Letters Patent No. 178,086, dated May 30,1876; application filed Apri1 7, 1874.

To all whom it may concern: v

Be it known that 1, MARK A. SPAFFORD, of Chicago, in the county of Cookand State of Illinois, have invented a new, useful, and ImprovedNut-Lock, of which the following is a full, clear, and exactdescription, which will enable others skilled in the art to which myinreference being had to the accompanying drawing, forming a parthereof, and in which- Figure 1 is a side elevation of my improveddevice; and Fig. 2, a vertical central longi- Like letters of referenceindicate like parts. The objector" my invention is to improvetheconstruction and operation of the means employed to lock nuts uponbolts; and to that end it consists in sinking a longitudinal and inproviding the nut with a' soft-metal after the nut is set, substantiallyas hereinafter specified.

In the drawing, A represents the bolt. ais the longitudinal groovesunken into the screwthreaded part of the bolt. B is the nut. O is acomparatively thin flange or annular rim or tongue, continuous with thescrew-threaded part of the nut. w

After the nut is set, that part of the flange which lies over the groovea is driven into the said groove by being struck for that purpose with asuitable instrument, it being understood that the flange is made of softmetal. By this means the nut may be firmly looked after being set.

I deem it preferable to make the part0 in the manner shown anddescribed; but instead of beilig annular and continuous with thescrew-threaded part of the nut, it may consist of a narrow tonguearranged in any suitable position on the nut, and sufficiently long toenter the groove by being bent in the manner described.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

A nut-lock, consisting of a bolt having a longitudinal groove sunkeninto its screwthreaded part, and of a nut provided with a soft-metaltongue, arranged substantially as specified, to enter the said groove bybeing operated upon, in the manner described.

MARK A. SPAFFORD.

